Sparebank 1 - Personal API (Powershell)

sb1-api.ps1

# Go here for more information: https://developersparebank1.no/personlig-klient

$ClientID = ''
$ClientSecret = ''
$FinInst = ''
$RedirectUrl = 'http://localhost:8089/callback'

function New-StateCode {
    return [System.Random]::new().Next();
}

# New Token
function Start-ListenCallback {
    # enter this URL to reach PowerShell’s web server
    $url = 'http://localhost:8089/'

    # start web server
    $listener = New-Object System.Net.HttpListener
    $listener.Prefixes.Add($url)
    $listener.Start()

    try
    {
      while ($listener.IsListening) {  
        # process received request
        $context = $listener.GetContext()
        $Request = $context.Request
        $Response = $context.Response

        $received = $Request.url.Query
        if($received -match "code=(.*?)(?:&|$)") {
            $Response.statuscode = 200
        
            $buffer = [Text.Encoding]::UTF8.GetBytes("Ok")
            $Response.ContentLength64 = $buffer.length
            $Response.OutputStream.Write($buffer, 0, $buffer.length)

            $Response.Close()
            return $Matches[1]
        }
        else {
            $Response.statuscode = 400
        
            $buffer = [Text.Encoding]::UTF8.GetBytes("Error")
            $Response.ContentLength64 = $buffer.length
            $Response.OutputStream.Write($buffer, 0, $buffer.length)

            $Response.Close()
        }
      }
    }
    finally
    {
      $listener.Close();
    }
}

$authUrl = "https://api.sparebank1.no/oauth/authorize?finInst=$FinInst&client_id=$ClientID&state=$(New-StateCode)&redirect_uri=$([System.Web.HttpUtility]::UrlEncode($RedirectUrl))&response_type=code";

Start-Process $authUrl
$code = Start-ListenCallback

$req = Invoke-RestMethod -Method Post -Uri 'https://api.sparebank1.no/oauth/token' -ContentType 'application/x-www-form-urlencoded' -Body @{
    client_id     = $ClientID
    client_secret = $ClientSecret
    code          = $code
    grant_type    = 'authorization_code'
    state         = New-StateCode
    redirect_uri  = $RedirectUrl
}

# Refresh Token

$RefreshToken = ''

$req = Invoke-RestMethod -Method Post -Uri 'https://api.sparebank1.no/oauth/token' -ContentType 'application/x-www-form-urlencoded' -Body @{
    client_id     = $ClientID
    client_secret = $ClientSecret
    grant_type    = 'refresh_token'
    refresh_token = $RefreshToken
}